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Conservation of momentum has been one of the most unshakeable laws of physics. Reactionless drives violate conservation of momentum. The likelihood that this is flawed is infinitely greater than the likelihood that conservation of momentum has been overturned. End of story, as far as I'm concerned.

Anyone remember the EmDrive debacle? http://en.wikipedia.org/wiki/EmDrive

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I don't think conservation of momentum is under fire here - the vacuum fluctuations (due to second quantization, quantization of electron, quark, etc. fields) might pick up the difference... although I don't really know enough QFT to be definite. Not that I believe any of this though, haha, seems like complete bullshit. The original article, especially. None of the physics seems to make any sense.

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